Example 17 If "C, = "C,, find"Solution We have "C, = "C,n! n!i.e.9!(n – InterviewSolution

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1.	Example 17 If "C, = "C,, find"Solution We have "C, = "C,n! n!i.e.9!(n -9)! (n-8)! 8orn-8= 9orn= 17Therefore "C, = "C,7 = 1
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